未完成人 ("Mikanseijin", roughly "Incomplete Person") is a vocal track by ンダホ (Ndaho) and ぺけたん (Peketan), two members of the Japanese YouTuber collective Fischer's. The song originally appeared on Fischer's 2018 album 僕らの色 みんなの色 (Our Colors, Everyone's Colors). Composition and lyrics were handled by Ndaho, with arrangement by Keisuke Yamasaki (onetrap) and additional vocals from SilkRoad and chorus work by ko-saku. The track was added to maimai on day one of the maimai でらっくす (DX) era, debuting on July 11, 2019. Its in-game jacket features a whimsical illustration of Fischer's mascot-like characters, and the official music video is known for including the group's signature "みかん星人" (tangerine-like alien) characters, a visual motif that fans of Fischer's will recognize. The song's title plays on the Japanese word 未完成 (mikansei, "incomplete") and is a near-homophone for みかん星人, creating a layered pun that ties the track's lyrical theme of imperfection to the group's visual identity. In maimai, 未完成人 was removed from the arcade song list on March 24, 2022, making it one of the early DX-era tracks that became unavailable after a limited run. Its Expert chart was designed by シチミヘルツ (Shichimi Hertz), while the Master chart was crafted by はっぴー (Happy), a pairing of two well-known maimai note designers.